Fix windows signal test (this amends a bit the changes in https://code.google.com/p/dart/source/detail?r=44902)
Fix windows signal test
(this amends a bit the changes in
https://code.google.com/p/dart/source/detail?r=44902)

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1078803002

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@45020 260f80e4-7a28-3924-810f-c04153c831b5

computmaxer/pub,dart-lang/pub,maxwellpeterson-wf/pub,cjkao/dart-pub,dart-lang/pub